This paper is a report of the disaster investigation of July Heavy rain in Reiwa 2nd. This heavy rains have drained many bridges over the Kuma River. There is no fact that so many bridges over class a river have been flowed out in past disasters. It is important to investigate the damaged bridges and analyze the outflow mechanism for future disaster countermeasures. This paper shows the bridge disaster survey conducted from the time of the disaster to August. And it shows some research points for the future.
